Sun Bin

Green production technology of caprolactam

Ideal of green chemistry is the reaction of atom economy and production of environment-friendly green products. This requires that every atom in the raw materials would transfer into the production, no production is of waste and by-products, and no usage of the poisonous and harmful materials. Practice the concept of green chemistry, Research Institute of Petroleum Processing successfully developed the green caprolactam production technology, to construct 200 kt/a plant. The innovation technology includes: TS-1 zeolite integration with single-vessel continuous slurry bed for cyclohexanone ammoximation; silicalite-1 zeolite integration with moving bed for cyclohexanone oxime rearrangement, and amorphous Ni alloy integration with magnetically stabilized bed for purification of caprolactam. Based on the commercial application results, the caprolactam production plant investment decrease 70%, operation costs decrease 10%, atom utilization rate increases to 90% from 60%, and essentially waste-free, respectively. Green caprolactam production technology produces great economic and social benefits, practices green chemistry concepts, and be a successful example of green chemistry.

Modification effect of Pd and Pt on Ru/ZrO 2 catalyst for partial hydrogenation of benzene to cyclohexene

We report the modification effects of Pd and Pt on the partial hydrogenation of benzene to cyclohexene over the Ru/ZrO2 catalyst. The Ru/ZrO2, Ru-Pd/ZrO2 and Ru-Pt/ZrO2 catalysts were prepared by the wetness impregnation-chemical reduction method at room temperature. The catalysts were characterized by N2 physisorption, H2 chemisorption, powder X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS), transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), and differential scanning calorimetry (DSC). It was identified that the Ru-Pd and Ru-Pt alloys were formed on the Ru-Pd/ZrO2 and Ru-Pt/ZrO2 catalysts, which improved the coordination number of Ru. In the partial hydrogenation of benzene to cyclohexene, while the modification of the Ru/ZrO2 catalyst with Pd or Pt decreased the turnover frequency (TOF) of benzene, the initial selectivity ( S 0) to cyclohexene was improved. The Ru-Pd/ZrO2-0.2 and Ru-Pt/ZrO2-0.15 catalysts with the optimal Pd/Ru and Pt/Ru molar ratios of 0.2 and 0.15 exhibited similar S 0 and the yield of cyclohexene of about 77% and 44%, respectively. On the basis of the characterization results, the modification effects of Pd and Pt on the activity and selectivity of the Ru/ZrO2 catalyst were discussed.